Sprint users

Do you any of you girls know if you can block a number from your phone or online? Or do I actually have to call sprint. My mom keeps calling me and leaving me horrible harassing messages. I need to have her number blocked. I have tried looking online but it's giving me a hard time.

Any suggestions? TIA :)

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I'm Ashlyne. I have a 20 month old son named Ricky. I have been with my son's father for 4 years but he hasn't put a ring on it.